Thanks a lot for this ! I actually called Sennheiser USA and emailed Neumann, and no one got in touch with me... I'm glad you are here. So this could be it, this "K49FET'", could be a "K47FET" with the backplate wired, as the TLM49 is leaning towards hypercardioid, when the U47FET is not. Could that be the explanation ?

They were both explained to me as being identical in function and design. So your assumption is either based on your superior fact finding abilities, compared to what I could accomplish, or is erroneous.

They were both explained to me as being identical in function and design. So your assumption is either based on your superior fact finding abilities, compared to what I could accomplish, or is erroneous.

Well I'm just trying to guess why they have two identical parts with different number. But as much as I wish I had those abilities, even more I rely on your expertise. I guess I will buy it, and I could post pictures on this thread, if anyone is interested.